Laser ranging device and automatic cleaning device

ABSTRACT

The present disclosure relates to a laser ranging device. The laser ranging device includes an encoded chassis, a rotary disc, a first barrier ring on the rotary disc and/or a second barrier ring on the encoded chassis. The encoded chassis includes a rotary bin and a plurality of ranging teeth disposed at intervals on the periphery of the rotary bin. The rotary disc is mounted within the encoded chassis and is rotatable within the rotary bin when the rotary disc is driven. The first barrier ring is disposed at the edge of the bottom surface of the rotary disc and the second barrier ring is disposed at the periphery of the ranging teeth, and the first barrier ring is located at the periphery of the ranging teeth after the rotary disc is mounted to the encoded chassis.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation application of U.S. patentapplication Ser. No. 16/023,178, filed Jun. 29, 2018 which is based uponand claims priority to PCT International Application No.PCT/CN2016/108937 filed on Dec. 7, 2016, which claims the priority toChinese patent application No. 201511021200.6, filed on Dec. 30, 2015,the entire contents of all of which are incorporated herein by referencein their entireties for all purposes.

TECHNICAL FIELD

The present disclosure relates to the field of laser technology,particularly to a laser ranging device which is waterproof anddustproof, and more particularly to a laser ranging device for anautomatic cleaning device.

BACKGROUND

In old days, measurement of distance was made by rulers. However, it wasa challenge to measure a long distance with a ruler. With thedevelopment of technology, ranging devices with laser has beendeveloped.

As demand for multi-directional laser ranging measurement is increasing,rotation ranging method has been employed. However, sometimes, a laserranging device may not be waterproof or dustproof, and accumulation ofdust over time may block the view of the ranging component and cause theranging component to fail in measurement or may reduce accuracy ofmeasured data. In other cases, when water gets into the laser rangingdevice, water may drip onto the circuit board of the laser rangingdevice, resulting in short circuit and even burning the circuit board,such that the laser ranging device cannot work properly.

SUMMARY

The present disclosure provides laser ranging devices and a method ofmanufacturing a laser ranging device.

According to a first aspect of the present disclosure, a laser rangingdevice is provided. The laser ranging device may include: an encodedchassis comprising a rotary bin and a plurality of ranging teethdisposed at intervals on the periphery of the rotary bin; a rotary discthat is mounted within the encoded chassis and is rotatable within therotary bin when the rotary disc is driven; and a first barrier ringdisposed on the rotary disc; where the first barrier ring is disposed atthe edge of the bottom surface of the rotary disc and is located at theperiphery of the ranging teeth after the rotary disc is mounted to theencoded chassis

According to a second aspect of the present disclosure, a laser rangingdevice is provided. The laser ranging device may include: an encodedchassis comprising a rotary bin and a plurality of ranging teethdisposed at intervals on the periphery of the rotary bin; a rotary discthat is mounted within the encoded chassis and is rotatable within therotary bin when the rotary disc is driven; and a first barrier ringdisposed on the encoded chassis and located at the periphery of theplurality of ranging teeth.

According to a third aspect of the present disclosure, a method ofmanufacturing a laser ranging device is provided. The method may includeproviding an encoded chassis that comprises a rotary bin and a pluralityof ranging teeth disposed at intervals on the periphery of the rotarybin; providing a rotary disc that is mounted within the encoded chassisand is rotatable within the rotary bin when the rotary disc is driven;and providing a first barrier ring disposed on the rotary disc; wherethe first barrier ring is disposed at the edge of the bottom surface ofthe rotary disc and is located at the periphery of the ranging teethafter the rotary disc is mounted to the encoded chassis.

It should be understood that both the foregoing general description andthe following detailed description are exemplary and explanatory onlyand are not restrictive of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute apart of this specification, illustrate examples consistent with thedisclosure and, together with the description, serve to explain theprinciples of the disclosure.

FIG. 1 is a schematic diagram illustrating an overall structure of alaser ranging device according to the present disclosure;

FIG. 2 is a schematic diagram illustrating decomposed structures of alaser ranging device according to the present disclosure;

FIG. 3 is a schematic diagram illustrating a structure of a rotary discin a laser ranging device according to the present disclosure;

FIG. 4 is a schematic three-dimensional diagram illustrating an encodedchassis in a laser ranging device according to the present disclosure;and

FIG. 5 is a top view of an encoded chassis in a laser ranging deviceaccording to the present disclosure.

Skilled artisans will appreciate that elements in the figures areillustrated for simplicity and clarity and have not necessarily beendrawn to scale. For example, the dimensions and/or relative positioningof some of the elements in the figures may be exaggerated relative toother elements to help to improve understanding of various examples ofthe present disclosure. Also, common but well-understood elements thatare useful or necessary in a commercially feasible example are often notdepicted in order to facilitate a less obstructed view of these variousexamples. It will further be appreciated that certain actions and/orsteps may be described or depicted in a particular order of occurrencewhile those skilled in the art will understand that such specificitywith respect to sequence is not actually required. It will also beunderstood that the terms and expressions used herein have the ordinarytechnical meaning as is accorded to such terms and expressions bypersons skilled in the technical field as set forth above, except wheredifferent specific meanings have otherwise been set forth herein.

DETAILED DESCRIPTION

The present disclosure will now be described in detail with reference tothe examples shown in the accompanying drawings. However, these examplesare not intended to limit the present disclosure. Modifications instructures, methods, or functions made by those skilled in the art inaccordance with these examples fall within the scope of the presentdisclosure.

The terminology used in the present disclosure is only for the purposeof describing particular examples and is not intended to limit thepresent disclosure. Terms “a (an)”, “said” and “the” in singular formsused in the present disclosure and the appended claims are also intendedto include plural forms, unless the context clearly dictates otherwise.It also should be understood that the term “and/or” used herein refersto and encompasses any or all of the possible combinations of one ormore associated listed items.

It shall be understood that, although the terms “first,” “second,”“third,” etc. may be used herein to describe various information, theinformation should not be limited by these terms. These terms are onlyused to distinguish one category of information from another. Forexample, without departing from the scope of the present disclosure,first information may be termed as second information; and similarly,second information may also be termed as first information. As usedherein, the term “if” may be understood to mean “when” or “upon” or “inresponse to” depending on the context.

As shown in FIGS. 1 and 2, FIG. 1 is a schematic diagram illustrating anoverall structure of a laser ranging device according to the presentdisclosure, and FIG. 2 is a schematic diagram illustrating decomposedstructures of a laser ranging device according to the presentdisclosure. The laser ranging device 100 according to the presentdisclosure includes an encoded chassis 11, a rotary disc 12, a rangingcomponent 13 and an upper cover 14. The encoded chassis 11 includes arotary bin 111 thereon and a plurality of ranging teeth 112 disposed atintervals on the periphery of the rotary bin 111. Each of the rangingteeth 112 of the encoded chassis 11 may have a predetermine width andthe distance between any two of the ranging teeth 112 may also bepredetermined. Because of that, the encoded chassis 11 has apredetermined structure and may be considered encoded. The encodedchassis 11 has a disc that works with other discs like the rotary disc12, the ranging component 13 and the upper cover 14 to achievepredetermined functions.

The ranging teeth 112 in cooperation with a pair of optocoupler elementsin the ranging component 13 are configured to measure a rotation speedof the rotary disc 12. However, if the rotating optocoupler element isblocked by dust, an angular velocity of the LDS (semiconductor laser, alaser distance sensor) may not be measured, directly affecting theaccuracy of the measured ranging data.

Then, the automatic cleaning device (also known as a sweeping robot) mayfail to locate obstacles and cannot work properly. The rotary disc 12 ismounted within the encoded chassis 11, specifically mounted within therotary bin 111 of the encoded chassis 11, and is rotatable within therotary bin 111 when being driven. The ranging component 13 is mounted onthe rotary disc 12 and is rotated with the rotary disc 12. The uppercover 14 is mounted on the encoded chassis 11 such that the rotary disc12, the ranging component 13, the rotary bin 111 and other component arelocated between the upper cover 14 and the encoded chassis 11, so as toprotect the components within the laser ranging device 100 and assistthe dustproof and waterproof function.

A cordless power supply circuit board for the LDS is disposed below acentral round hole of the encoded chassis 11 and the rotary disc 12. Afan circuit board is disposed below the LDS. If water drips onto thecircuit boards, the circuit boards may be damaged immediately andrequire replacement. As shown in FIGS. 1 and 5, in an example of thepresent disclosure, in order to protect the circuit boards in the LDS,the laser ranging device 100 may include a first barrier ring 121disposed on the rotary disc 12 and/or a second barrier ring 113 disposedon the encoded chassis 11. Specifically, when a first barrier ring 121is disposed on the rotary disc 12, the first barrier ring 121 may bedisposed at the edge of the bottom surface of the rotary disc 12. When asecond barrier ring 113 is disposed on the encoded chassis 11, thesecond barrier ring 113 may be disposed on the periphery of the rangingteeth 112.

Further, the first barrier ring 121 is a protrusion on a side of therotary disc 12 facing the encoded chassis 11. The first barrier ring 121may be integrally formed with the rotary disc 12. After the rotary disc12 is mounted on the encoded chassis 11, the first barrier ring 121 islocated on the periphery of the ranging teeth 112 with a gap formedbetween the first barrier ring 121 and the encoded chassis 11, such thatthe rotary disc 12 does not interfere with the encoded chassis 11 whenthe rotary disc 12 is rotating. Preferably, the gap between the firstbarrier ring 121 and the encoded chassis 11 may be as small as possiblesuch that the dustproof area may be increased. In addition, with thefirst barrier ring 121 extending from the rotary disc 12 to the encodedchassis 11, it may avoid water flowing into the encoded chassis 11 fromthe rotary disc 12. Instead, water may be guided by the first barrierring 121 to the periphery of the encoded chassis 11, achieving awaterproof function.

The second barrier ring 113 is a protrusion on a side of the encodedchassis 11 facing the rotary disc 12. The protrusion may be integrallyformed with the encoded chassis 11. A gap is formed between the secondbarrier ring 113 and the rotary disc 12. Preferably, the gap between thesecond barrier ring 113 and the rotary disc 12 may be as small aspossible as long as the second barrier ring 113 does not interfere withthe rotary disc 12 when the rotary disc 12 is rotating.

In an example of the present disclosure, both the first barrier ring 121and the second barrier ring 113 are included, and after the rotary disc12 is mounted on the encoded chassis 11, the second barrier ring 113 ispositioned between the first barrier ring 121 and the ranging teeth 112.In the present example, projections of the first barrier ring 121 andthe second barrier ring 113 on a vertical plane are partiallyoverlapped. That is, the first barrier ring 121 and the second barrierring 113 are partially overlapped such that S-shaped space is formedbetween the first barrier ring 121 and the second barrier ring 113, tocompletely solve the waterproof problem and improve the dustproofeffect. In particular, since there is a gap between the first barrierring 121 and the encoded chassis 11, there will be somehow a portion ofdust and water getting into the rotary bin 111 of the encoded chassis11. In this regard, a second barrier ring 113 is included, to compensatefor the drawback of the gap between the first barrier ring 121 and theencoded chassis 11.

Preferably, the encoded chassis 11 also includes at least one slot 114disposed thereon. The slot 114 may be disposed outside of the rangingteeth 112. Preferably the slot 114 is located at a positioncorresponding to the position on the encoded chassis 11 to which theouter edge of the first barrier ring 121 extends. With thisconfiguration, the dust or water blocked by the first barrier ring 121may fall to the slot 114, and eventually fall outside from the bottomsurface of the encoded chassis 11 through the slot 114, to preventaccumulation of dust and water. In an example, a plurality of slots 114are provided in the encoded chassis 11 and distributed evenly in theposition on the encoded chassis 11 to which the outer edge of the firstbarrier ring 121 extends. In an example, a first water guidanceprotrusion (not shown in the figure) is disposed at the position on theencoded chassis 11 facing away from the slot 114 (i.e., the position onthe bottom surface of the encoded chassis 11 corresponding to the slot114). The first water guidance protrusion is configured to guide waterand dust to flow downward, to avoid water flowing to other positions andcausing water leakage for the circuit boards.

The laser ranging device 100 also includes a driving means 15 disposedadjacent to the rotary disc 12 to drive the rotary disc 12 to rotate. Inan example of the present disclosure, the driving means 15 is a servomotor mounted on the bottom surface of the encoded chassis 11 with thedrive shaft of the driving means 15 running through the encoded chassis11. Above the encoded chassis 11, a transmission wheel 151 is mounted onthe drive shaft, together with a conveyor belt mounted to thetransmission wheel 151 and the rotary disc 12, are configured to drivethe rotary disc 12 to rotate. The encoded chassis 11 also includes adrive bin adjacent to the rotary bin 111. The transmission wheel 151 islocated in the drive bin. The servo motor is mounted below the drive binsuch that the space within the laser ranging device 100 may be utilizedreasonably.

The encoded chassis 11 also includes thereon a water-dust-proof wall 115disposed between the rotary bin 111 and the drive bin. Thewater-dust-proof wall 115 separates the rotary bin 111 from the drivebin to prevent water dripping into the drive bin from flowing into therotary bin 111. Moreover, the water-dust-proof wall 115 may function toprevent dust from being transferred to the rotary bin 111 from the drivebin. The water-dust-proof wall 115 may be a protrusion extending upwardfrom the surface of the encoded chassis 11.

Further, the encoded chassis 11 may also include a recess 116 adjacentto the water-dust-proof wall 115. The recess 116 and the rotary bin 111are located respectively at two sides of the water-dust-proof wall 115.In the present disclosure, two recesses 116 are provided, andrespectively located at the waist portion of the encoded chassis 11between the rotary bin 111 and the drive bin. A guidance hole 1161 isprovided on the bottom surface of the recess 116. The recess 116 isconfigured to collect dust, and dust around the recess 116 may all beguided into the recess 116, to reduce the amount of dust entering intothe rotary bin 111. The guidance hole 1161 on the bottom surface of therecess 116 may allow a portion of dust to be discharged from the guidehole 1161. In addition, the recess 116 may also be configured to collectwater, prevent dust and discharge water.

The water collecting function is mainly implemented by a watercollection space formed by the first barrier ring 121 andwater-dust-proof wall 115. The dust proof function is mainly implementedin that, the outer edge of the first barrier ring 121 and the upper edgeof the water-dust-proof wall 115 form a slit that causes the path of thedust entering with wind to be changed downward by the first barrier ring121, to significantly reduce the amount of entering dust. In addition,then the second barrier ring 113 may be included to bring the wind withdust to an additional path from bottom to top, to further reduce theamount of dust. With guidance of other components, a portion of thewater dripping on the laser ranging device 100 may be guided into therecess 116. The recess 116 allows water to flow out of the laser rangingdevice 100 through the guide hole 1161. Also, the water flowing out maybring dust to flow out of the laser ranging device 100 together with it.

Preferably, the encoded chassis 11 also includes a second water guidanceprotrusion (not shown in the figure) disposed on the bottom surface ofthe encoded chassis 11 and corresponding to the guide hole 1161. Thesecond water guidance protrusion serves to guide the drainage, andprevent water flowing from above the encoded chassis 11 from beingguided by the bottom surface of the encoded chassis 11 to the maincircuit board under the LDS in the host machine and damaging the maincircuit board, and from being guided to the driving means 15 anddamaging the driving means 15. The water guidance protrusion is formedby the bottom surface of the encoded chassis 11 extending downward.There is a gap between the water guidance protrusion and the drivingmeans 15, such that water flowing out of the water guidance protrusionwill not drip onto the driving means 15. In the present example, thewater above the encoded chassis 11 flows to the bottom surface of theencoded chassis 11 through the guide hole 1161, and drips outsidethrough the water guidance protrusion, thereby preventing the drippingwater from flowing to other places.

Further, the encoded chassis 11 also includes thereon a third barrierring 117 disposed on the circumference of the drive shaft. The thirdbarrier ring 117 is disposed below the transmission wheel, in order toprotect the driving means 15, and avoid water flowing downward throughthe hole penetrating the drive draft on the encoded chassis 11 anddripping onto the driving means 15, thereby causing damage to the drivemeans 15. In addition, the encoded chassis 11 also includes thereon aconnecting portion 118 for connection to the driving means 15. Awaterproof protrusion 119 is disposed on the circumference of theconnecting portion 118. For example, in an example of the presentdisclosure, the driving means 15 is screwed to the encoded chassis 11,and a threaded hole is provided in the encoded chassis 11correspondingly. Therefore, after water gets into the laser rangingdevice 100, water may drip from the threaded hole and directly drip ontothe driving means 15, probably causing the driving means 15 to beshort-circuited. In this regard, a waterproof projection 119 is providedon the circumference of the threaded hole. However, the connectingportion in the present disclosure is not limited to the threaded hole,but may also be a connecting portion of other structure. The waterproofprojection 119 is provided to prevent water from entering from theconnecting portion 118.

In still another aspect of an example of the present disclosure, thereis also provided an automatic cleaning device including a machine bodyand a laser ranging device as described above. The laser ranging deviceis provided in the machine body, and the automatic cleaning device mayhave a dustproof and waterproof effect due to the dustproof andwaterproof function of the laser ranging device.

In the laser ranging device and the automatic cleaning device accordingto the present disclosure, by providing a plurality of water-dust-proofwalls, dust water storage chambers and water guidance protrusions to thelaser ranging device, it may block dust and prevent water from entering,and achieve an effect of protecting the components in the laser rangingdevice. Therefore, it may prolong the service life of the laser rangingdevice, and may avoid the accuracy of the ranging data being affected bythe accumulation of dust.

The present disclosure provides a laser ranging device and an automaticcleaning device, which has waterproof and dustproof design.

According to a first aspect of the examples of the present disclosure,there is provided a laser ranging device, including:

an encoded chassis including a rotary bin and a plurality of rangingteeth disposed at intervals on the periphery of the rotary bin,

a rotary disc mounted within the encoded chassis and rotatable withinthe rotary bin when being driven; and

a first barrier ring disposed on the rotary disc;

wherein the first barrier ring is disposed at the edge of the bottomsurface of the rotary disc and located at the periphery of the rangingteeth after the rotary disc is mounted to the encoded chassis.

Optionally, the laser ranging device further includes a first barrierring and a second barrier ring, wherein the second barrier ring isdisposed on the periphery of the ranging teeth and located between thefirst barrier ring and the ranging teeth after the rotary disc ismounted to the encoded chassis.

Optionally, projections of the first barrier ring and the second barrierring on a vertical plane are partially overlapped.

Optionally, a gap exists between the first barrier ring and the encodedchassis, and a gap exists between the second barrier ring and the rotarydisc.

Optionally, the encoded chassis further includes at least one slotdisposed thereon, and the slot is disposed on outer edge of the rangingteeth.

Optionally, the encoded chassis further includes a first water guidanceprotrusion disposed at a position on the bottom surface of the encodedchassis corresponding to the slot.

Optionally, the encoded chassis further includes a drive bin adjacent tothe rotary bin, and the encoded chassis further includes thereon awater-dust-proof wall disposed between the rotary bin and the drive bin.

Optionally, the encoded chassis further includes a recess adjacent tothe water-dust-proof wall, the recess and the rotary bin are locatedrespectively at two sides of the water-dust-proof wall, and a guidancehole is provided on the bottom surface of the recess.

Optionally, the encoded chassis further includes a second water guidanceprotrusion disposed on the bottom surface of the encoded chassis andcorresponding to the guide hole.

Optionally, the laser ranging device further includes: a driving meansdisposed on the bottom surface of the encoded chassis with a drive shaftof the driving means running through the encoded chassis, wherein theencoded chassis further comprises thereon a third barrier ring disposedon the circumference of the drive shaft.

Optionally, the encoded chassis further includes thereon a connectingportion for connection to the driving means, and a waterproof protrusionis disposed on the circumference of the connecting portion.

Optionally, the laser ranging device further includes: a rangingcomponent mounted to the rotary disc and an upper cover mounted on theencoded chassis, wherein the rotary disc and the ranging component arelocated between the upper cover and the encoded chassis.

According to a second aspect of the examples of the present disclosure,there is provided an automatic cleaning device, including a machine bodyand the laser ranging device according to the above, which is providedin the machine body.

According to a third aspect of the examples of the present disclosure,there is provided a laser ranging device, including:

an encoded chassis including a rotary bin and a plurality of rangingteeth disposed at intervals on the periphery of the rotary bin,

a rotary disc mounted within the encoded chassis and rotatable withinthe rotary bin when being driven; and

a first barrier ring disposed on the encoded chassis and located at theperiphery of the plurality of ranging teeth.

Optionally, the laser ranging device further includes a second barrierring disposed on the edge of the bottom surface of the rotary disc,wherein the first barrier ring is located between the second barrierring and the ranging teeth after the rotary disc is mounted to theencoded chassis.

Optionally, projections of the first barrier ring and the second barrierring on a vertical plane are partially overlapped.

Optionally, a gap exists between the second barrier ring and the encodedchassis, and a gap exists between the first barrier ring and the rotarydisc.

Optionally, the encoded chassis further includes at least one slotdisposed thereon, and the slot is disposed outside of the ranging teeth.

Optionally, the encoded chassis further includes a first water guidanceprotrusion disposed at a position on the bottom surface of the encodedchassis corresponding to the slot.

Optionally, the encoded chassis further includes a drive bin adjacent tothe rotary bin, and the encoded chassis further includes thereon awater-dust-proof wall disposed between the rotary bin and the drive bin.

Optionally, the encoded chassis further includes a recess adjacent tothe water-dust-proof wall, the recess and the rotary bin are locatedrespectively at two sides of the water-dust-proof wall, and a guidancehole is provided on the bottom surface of the recess.

Optionally, the encoded chassis further includes a second water guidanceprotrusion disposed on the bottom surface of the encoded chassis andcorresponding to the guide hole.

Optionally, the laser ranging device further includes: a driving meansdisposed on the bottom surface of the encoded chassis with a drive shaftof the driving means running through the encoded chassis, wherein theencoded chassis further comprises thereon a third barrier ring disposedon the circumference of the drive shaft.

Optionally, the encoded chassis further includes thereon a connectingportion for connection to the driving means, and a waterproof protrusionis disposed on the circumference of the connecting portion.

Optionally, the laser ranging device further includes a rangingcomponent mounted to the rotary disc and an upper cover mounted on theencoded chassis, wherein the rotary disc and the ranging component arelocated between the upper cover and the encoded chassis.

According to a fourth aspect of the examples of the present disclosure,there is provided an automatic cleaning device, including a machine bodyand the laser ranging device according to above, which is provided inthe machine body.

The technical solutions provided by the examples of the presentdisclosure may have the following advantageous effects. In the laserranging device and the automatic cleaning device according to thepresent disclosure, by providing a plurality of water-dust-proof walls,dust water storage chambers and water guidance protrusions to the laserranging device, it may block dust and prevent water from entering, andachieve an effect of protecting the components in the laser rangingdevice. Therefore, it may prolong the service life of the laser rangingdevice.

Other examples of the disclosure will be apparent to those skilled inthe art from consideration of the specification and practice of thedisclosure disclosed here. This application is intended to cover anyvariations, uses, or adaptations of the disclosure following the generalprinciples thereof and including such departures from the presentdisclosure as come within known or customary practice in the art. It isintended that the specification and examples be considered as exemplaryonly, with a true scope and spirit of the disclosure being indicated bythe following claims.

It will be appreciated that the present disclosure is not limited to theexact construction that has been described above and illustrated in theaccompanying drawings, and that various modifications and changes may bemade without departing from the scope thereof.

1. A laser ranging device, comprising: an encoded chassis comprising arotary bin and a plurality of ranging teeth disposed at intervals on theperiphery of the rotary bin; a rotary disc that is mounted within theencoded chassis and is rotatable within the rotary bin when the rotarydisc is driven; and a first barrier ring disposed on the rotary disc;wherein the first barrier ring is disposed at the edge of the bottomsurface of the rotary disc and is located at the periphery of theranging teeth after the rotary disc is mounted to the encoded chassis.2. The laser ranging device according to claim 1, further comprising asecond barrier ring that is disposed on the periphery of the rangingteeth and is located between the first barrier ring and the rangingteeth after the rotary disc is mounted to the encoded chassis.
 3. Thelaser ranging device according to claim 2, wherein projections of thefirst barrier ring and the second barrier ring on a vertical plane areat least partially overlapped.
 4. The laser ranging device according toclaim 3, wherein a gap exists between the first barrier ring and theencoded chassis, and a second gap exists between the second barrier ringand the rotary disc.
 5. The laser ranging device according to claim 1,wherein the encoded chassis further comprises at least one slot disposedthereon, and the at least one slot is disposed outside of the rangingteeth.
 6. The laser ranging device according to claim 5, wherein theencoded chassis further comprises a first water guidance protrusiondisposed at a position on the bottom surface of the encoded chassiscorresponding to the at least one slot.
 7. The laser ranging deviceaccording to claim 1, wherein the encoded chassis further comprises adrive bin adjacent to the rotary bin, and the encoded chassis furthercomprises thereon a water-dust-proof wall disposed between the rotarybin and the drive bin.
 8. The laser ranging device according to claim 7,wherein the encoded chassis further comprises a recess adjacent to thewater-dust-proof wall, the recess and the rotary bin are locatedrespectively at two sides of the water-dust-proof wall, and a guidancehole exists on the bottom surface of the recess.
 9. The laser rangingdevice according to claim 8, wherein the encoded chassis furthercomprises a second water guidance protrusion disposed on the bottomsurface of the encoded chassis and corresponding to the guidance hole.10. The laser ranging device according to claim 1, further comprising: adriving means disposed on the bottom surface of the encoded chassis witha drive shaft of the driving means running through the encoded chassis,wherein the encoded chassis further comprises thereon a third barrierring disposed on the circumference of the drive shaft.
 11. The laserranging device according to claim 10, wherein the encoded chassisfurther comprises thereon a connecting portion for connecting theencoded chassis to the driving means, and a waterproof protrusion isdisposed on the circumference of the connecting portion.
 12. The laserranging device according to claim 1, further comprising a rangingcomponent mounted to the rotary disc and an upper cover mounted on theencoded chassis, wherein the rotary disc and the ranging component arelocated between the upper cover and the encoded chassis.
 13. Anautomatic cleaning device, comprising the laser ranging device accordingto claim 1, which is provided in a machine body.
 14. A laser rangingdevice, comprising: an encoded chassis comprising a rotary bin and aplurality of ranging teeth disposed at intervals on the periphery of therotary bin; a rotary disc that is mounted within the encoded chassis andis rotatable within the rotary bin when the rotary disc is driven; and afirst barrier ring disposed on the encoded chassis and located at theperiphery of the plurality of ranging teeth.
 15. The laser rangingdevice according to claim 14, further comprising a second barrier ringdisposed on the edge of the bottom surface of the rotary disc, whereinthe first barrier ring is located between the second barrier ring andthe ranging teeth after the rotary disc is mounted to the encodedchassis.
 16. The laser ranging device according to claim 15, whereinprojections of the first barrier ring and the second barrier ring on avertical plane are at least partially overlapped.
 17. The laser rangingdevice according to claim 16, wherein a gap exists between the secondbarrier ring and the encoded chassis, and a second gap exists betweenthe first barrier ring and the rotary disc.
 18. The laser ranging deviceaccording to claim 14, wherein the encoded chassis further comprises atleast one slot disposed thereon, and the at least one slot is disposedoutside of the ranging teeth.
 19. The laser ranging device according toclaim 18, wherein the encoded chassis further comprises a first waterguidance protrusion disposed at a position on the bottom surface of theencoded chassis corresponding to the at least one slot.
 20. A method ofmanufacturing a laser ranging device, comprising: providing an encodedchassis that comprises a rotary bin and a plurality of ranging teethdisposed at intervals on the periphery of the rotary bin; providing arotary disc that is mounted within the encoded chassis and is rotatablewithin the rotary bin when the rotary disc is driven; and providing afirst barrier ring disposed on the rotary disc; wherein the firstbarrier ring is disposed at the edge of the bottom surface of the rotarydisc and is located at the periphery of the ranging teeth after therotary disc is mounted to the encoded chassis.